Question

If a+b=2x-2 and a-b=4x-8 find a and b

Answer 1

a+b=2x-2.....1
a-b=4x-8......2
subtracting 2 from 1 we get,
a+b-(a-b)=2x-2-(4x-8)
2b= -2x+6
b= -x+3....3
puttying 3 in 1 we get,
a+(-x+3)=2x-2
a=3x-5

a=3x-5
b=-x+3